Mozilla Firefox Quantum

The soon to be released (November 14, 2017) Firefox Quantum is in public beta stage.
Powered by the Servo engine (programmed in Rust) it is supposed to be faster and use less memory resources.

Quantum is not a new web browser. Quantum is Mozilla's project to build the next-generation web engine for Firefox users, building on the Gecko engine as a solid foundation. Quantum will leverage the fearless concurrency of Rust and high-performance components of Servo to bring more parallelization and GPU offloading to Firefox.